Lost DXLAB WinWarbler RTTY after Upgrading 6300 to SSDR v1.6.17.74

I had RTTY working in both DXLAB WinWarbler and N1MM+ prior to upgrading SSDR in January.  Since then I have not been able to work RTTY in WinWarbler at all.  I did have it working in N1MM+, and used the setup in the BARTG contest but it, too, has stopped working.  N1MM later.  For now I would like to get WinWarbler set up.

Using WinWarbler v8.6.4.  I am receiving RTTY OK via 2Tone but not MMTTY.  This also means that I am unable to transmit.  When I try to transmit the rig LED turns red indicating that it's trying to transmit but MMTTY doesn't seem to be working, ZERO output.  The MMTTY pane in the WinWarbler screen shows nothing coming from MMTTY, 2Tone receive shows OK.  If I open up MMTTY standalone it receives but still no output from the 6300.  I have worked with AA6YQ at DXLAB trying to resolve this issue and Dave has been unable to solve the mystery. 

Again, this all worked prior to upgrading SSDR software.  It was not a smooth transition.  Now another upgrade is available but I want to get this resolve before going further.  I'm committed to the 6300.  The Pro III is gone.

When I searched for "6300 MMTTY WInWarbler" over a thousand posts showed.  I found no recent posts.  Most were not relevant.

Anyone using the 6300/DXLAB configuration?  I can send screen shots if needed.

73 from the desert,

Fred/NA2U